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1990 Mazda B2200 Question: how to get the rpm and timing right without accelerating the engine too much??

 

Question

juancarloslax, 2.2L 4 Cylinder, Sun Valley, CA, August 17, 2012, 20:56
 Rookie

put a ground wire from the green test connector.Set the rpm to 750 on idle and timing on 6. As soon I disconnect the ground wire,the engine accelerate and rpm goes over 800.The repair manual ask me to ground the test connector so i did.Just want to have my rpms right to smog check. Thanks.

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  • Answer #1

    August 19, 2012, 06:57
     Master

    Are you setting the idle speed with the ground connected or just the 'base' timing?

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    juancarloslax, August 19, 2012, 10:17
     Rookie

    Im setting idle speed and making sure timing is correct.Thats what the underhood label says: idle speed 750rpm and timing on 6 degrees. Just dont understand what is that ground wire connector for ? why do i need to ground it ??

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    ziptie12, August 19, 2012, 19:38
     Master

    That is for setting the 'base' ignition timing only. Disconnect , then adjust idle. What else was done , leading to the need to make adjustments?

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